package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class LoginInterceptor implements HandlerInterceptor {

   /* private StringRedisTemplate stringRedisTemplate;

    public LoginInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }*/

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /*//1、获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            //不存在，拦截
            response.setStatus(401);
            return false;
        }
        //2、基于Token获取redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        //3、判断用户是否存在
        if (userMap.isEmpty()){
            //4、不存在，拦截
            response.setStatus(401);
            return false;
        }

        //5、将查询到的Hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //6、存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        //7、刷新token的有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
*/
        //判断是否需要拦截(ThreadLocal中是否有用户)
        if (UserHolder.getUser() == null){
            //没有，需要拦截，设置状态码
            response.setStatus(401);
            //拦截
            return true;
        }
        //有用户则放行
        return true;
    }

    /*@Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        //移除用户
        UserHolder.removeUser();
    }*/
}
